Biology Questions and Answers

class 12 NCERT BIHAR BOARD (INDIA)

what is inhibitory gene interaction or dominant supressor gene interaction?

To cause cancer, proto-oncogenes require _____ allele(s) to be mutated and therefore are considered ________. The mutation results in a ___ of function.

While webbed feet were evolving in ancestral ducks, with each generation: a) most ducks had about the same amount of webbing on their feet as their parents b) most ducks had more webbing on their feet than their parents c) most ducks had less webbing on their feet than their parents d) the amount of webbing on duck's feet had no relationship with the amount thier parents had

"Q5.1. Which of the following is FALSE? • If a genetic disease reduces fertility and the allele that causes the disease offers no other advantage, the allele will likely eventually disappear, due to natural selection. Natural selection does not favor individuals who are homozygous for the sickle-cell allele, because these individuals typically die before they are old enough to reproduce. Individuals who are heterozygous HbA/HbS are protected from malaria, and this is why sickle-cell disease persists in wetter, mosquito-prone regions in Africa. In regions where malaria does not occur, individuals who are heterozygous HbA/HbS have a fitness advantage over those who are homozygous for the normal hemoglobin allele (HbA)."

"Multiple choice question. Which of the following best describes alleles? Alleles allow DNA to be wrapped and organized into chromosomes. Alleles are the basic unit of inheritance for cells. Alleles are variations of genes and include examples such as eye color, height, and ability to digest lactose. Alleles are specific locations on genes that code for proteins and other protein products. "

What are the four main steps of cellular respiration?

What are 10 biotic factors of the desert? Cacti Desert shrubs Lizards Snakes Desert tortoises Coyotes Desert foxes Insects (e.g., beetles, ants) Birds (e.g., hawks, owls) Scorpions

When does DNA replication happen and why?

Describe the three types of predation and give an example of each.

List and describe the four principles of natural selection.

"Q3.6. The farmer's experiment was widely considered to be well-designed and well-implemented. After 8 weeks, he found no difference between groups, and the berry harvest was still lower than in previous years. What can he conclude about his hypothesis? Rodents are eating the berries. Birds are eating the berries. Birds are not eating the berries. The results do not address the hypothesis."

Which phrase is the best definition of a gene? ○ a specific segment of DNA on a chromosome ○ the DNA found in gametes ○ all of the DNA that makes up a chromosome

What are five abiotic factors and five biotic factors in the tropical rainforest?

"What is an example of a biological hazard? A. Norovirus B. Chlorine C. Insulation D. Hair"

Can paramecium be harmful? How so?

Codons are found on which molecule? A. DNA B. mRNA C. tRNA D. Proteins

How is the T4 phage different from the lambda phage? The T4 phage contains double stranded DNA as its genetic material, the lambda phage contains RNA. The lambda phage contains double stranded DNA as its genetic material, the T4 phage contains RNA. The lambda phage is capable of entering the lysogenic cycle, T4 phage are strictly lytic. The T4 phage is capable of entering the lysogenic cycle, lambda phage are strictly lytic. The T4 phage infects bacterial cells, the lambda phage infects animal cells.

What are the advantages of recombination during meiosis? Check All That Apply Check All That Apply $\square$ increased genetic variation $\square$ segregation of homologous chromosomes into separate daughter cells during meiosis I $\square$ reduced rates of nondisjunction $\square$ segregation of sister chromatids into separate daughter cells during meiosis II

Why does DNA travel toward the positive electrode during gel electrophoresis?

Describe the symbiotic relationship that exists between the cuckoo and the warbler in an environment without predators.

Consider acetylsalicylic acid (HC9H7O4; molar mass: 180.16 g/mol), an active ingredient for aspirin. The structure is shown below. c) This weak acid solution is titrated with 0.1103 M KOH solution. (iv) Determine the pH when the KOH solution is added 1.00 mL less than the equivalence point. (v) Determine the pH when the KOH solution is added 1.00 mL more than the equivalence point. d) Draw the titration curve. Find the buffer region. Explain. e) Which indicator will be proper to show the end point? Explain.

"Which best defines heredity? A) Heredity is the physical and personality traits displayed by the majority of a population. B) Heredity is the traits that are expressed by an organism in response to the environment. C) Heredity is the behaviors that are shown by offspring which are learned from their parents. D) Heredity is the passage of genetic instructions from generation to generation through DNA."

What are the seven stages of the plant life cycle?

Does cellular respiration occur in both plants and animals or just in animals, and why?

What are the three parts of the cell theory?

According to endosymbiosis, what is the best explanation for how eukaryotic cells evolved?

Give an IUPAC name for the following compound: Give an IUPAC name for the following compound: Give an IUPAC name for the following compound: Drew 3-hexene Give an IUPAC name for the following compound:

"In C3 plants, the conservation of water promotes _____. A. photorespiration B. a shift to C4 photosynthesis C. photosynthesis D. the opening of stomata E. the light reactions"

Explain the symbiotic relationship between the ostrich and the gazelle.

Write the chemical and word equations for photosynthesis.

"The farmer's experiment was widely considered to be well-designed and well-implemented. After 8 weeks, he found no difference between groups, and the berry harvest was still lower than in previous years. What can he conclude about his hypothesis? A. Rodents are eating the berries. B. Birds are eating the berries. C. Birds are not eating the berries. D. The results do not address the hypothesis."

"If there is no selective advantage for one nose color over another in wolves, which of the following statements is most likely true about the change in wolf nose colors over many generations? A. The frequency of black noses will increase significantly. B. The frequency of brown noses will decrease significantly. C. The frequencies of both black and brown noses will remain relatively stable. D. The frequency of brown noses will increase significantly."

Complete the following CER (Claim, Evidence, Reasoning) task: Claim: Elephants and lions need energy to survive. Evidence: (Provide evidence related to how elephants and lions obtain energy.) Reasoning: (Explain the role of macromolecules in providing energy for elephants and lions.)

What are the units for coefficients of friction? Select the correct answer Both the coefficient of static friction and the coefficient of kinetic friction have units of Newtons. The coefficient of static friction is unitless; the coefficient of kinetic friction has units of $\mathrm{m} / \mathrm{s}$ Both the coefficient of static friction and the coefficient of kinetic friction are unitless. The coefficient of static friction has units of meters (m); the coefficient of kinetic friction has units of $\mathrm{m} / \mathrm{s}$ The coefficient of static friction has units of Newtons ( N ); the coefficient of kinetic friction has units of $\mathrm{N} / \mathrm{s}$

What is the symbiotic relationship between the cuckoo bird and the warbler?

# Quiz: Fragments, Run-ons, and Modifiers 3:Effective Sentences 5. Which sentence has a dangling modifier? While looking for a campsite, a tornado touched down near the park. Inexpensive and fun, camping is a great way to spend a weekend. Sturdy yet comfortable, my new hiking boots will enable me to explore on foot. Bicycling along a bike trail, my friend Mark spotted a white-tailed deer munching on some leaves.

Approximately two-thirds of the mass of a cell is water, and the water maintains the cell's integrity. What would happen to a plant cell during a period of severe drought? A. The drought would have no effect on the plant cell. B. The cell would expand, leading to an increase in growth. C. The cell would increase its capacity to do photosynthesis. D. The cell would eventually shrink, causing the plant to wilt.

For each atom in the table below, write down the subshell from which an electron would have to be removed to make a +1 cation and the subshell to which an electron would have to be added to make a -1 anion. The first row has been completed for you. | Atom | Subshell from which electron removed to form +1 cation | Subshell to which electron added to form -1 anion | | --- | --- | --- | | H | 1s | 1s | | Hg | | | | Ne | | | | K | | |

Drag the appropriate labels to their respective targets.