Question 40 (1 point) Diffusion is Question 40 options: a)One type of active tra

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Question 40 (1 point)

Diffusion is

Question 40 options:

a)One type of active transport

b)The movement of water across the cell membrane

c)The movement of molecules from an area of low concentration to an area of high concentration

d)The movement of molecules from an area of high concentration to an area of low concentration

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Question 41 (1 point)

Any individual organism has the potential to adapt to its environment, if it is given enough time and possesses a mechanism to generate variation.

Question 41 options:

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Question 42 (1 point)

One would expect more evolutionary change to occur in a population when resources are limited relative to that same population at a time when resources are abundant.

Question 42 options:

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Question 43 (1 point)

The main function of a ribosome is to ____________________.

Question 43 options:

extract energy from glucose

synthesize glucose

store food in the form of fat

synthesize proteins

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Question 44 (1 point)

The effectiveness of a new medication is tested on a group of young male rabbits 3 weeks of age. The best control group would be:

Question 44 options:

any group of rabbits

a group of young male rabbits 3 weeks of age, not given the medication

a group of young female rabbits 3 weeks of age, not given the medication

no control is required; just measure whether the rabbits grew

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Question 45 (1 point)

The number of _______________ in the outer shell of an atom determines the type of chemical bonds an atom can make.

Question 45 options:

electrons

protons

ions

neutrons

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Question 46 (1 point)

You find a cell of a type you have never seen before. The cell has both a nucleus and a cell wall. Therefore, you conclude, it must be a _______________ cell.

Question 46 options:

liver

animal

bacterial

plant

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Question 47 (1 point)

The gene pool of a population may change due to:

Question 47 options:

migration

genetic drift

natural selection and mutation

all of the above

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Question 48 (1 point)

What is the evolutionary advantage of sexual reproduction?

Question 48 options:

Sexual reproduction is required for natural selection

Sexual reproduction increases the variation in the genetic material of a population, enabling evolution to occur more quickly

Meiosis produces haploid gametes that are necessary for sexual reproduction

All of the above are evolutionary advantages of sexual reproduction

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Question 49 (1 point)

Which of the following statements about DNA is FALSE?

Question 49 options:

DNA stores and transmits inherited genetic information

DNA contains the coded directions for making proteins

The two strands of DNA are held together by hydrogen bonds

All of the statements about DNA are True

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Question 50 (1 point)

One important component of DNA is ______

Question 50 options:

Carbohydrate

Amino Acid

Lipid

Sugar

a)One type of active transport

b)The movement of water across the cell membrane

c)The movement of molecules from an area of low concentration to an area of high concentration

d)The movement of molecules from an area of high concentration to an area of low concentration

Explanation / Answer

41. The movement of molecules from an area of high concentration to an area of low concentration.
Diffusion is a passive phenomenon which occurs in molecules causing their spreading. In diffusion molecules flow from their high concentration towards low concentration to attain an equilibrium.

42. TRUE.
That’s because when resources are limited the species fight for survival in limited resources and natural selection takes place. And in this process survival of fittest takes place that is fittest or the organism showing the most adaptability toward environmental stress is chosen to pass on its trait to nest generation causing a rapid evolutionary change.

43. Synthesize proteins
the ribosomes are cell organelles designed to read mRNA and translate it into proteins.

44. a group of young male rabbits 3 weeks of age, not given the medication
A control group is a group of individuals which have all the characteristics same (for e.g. sex, age) other than the tested parameter. Here tested parameter is new medicine so control group will be of rabbits of same age and sex just without the medicine.

45. Electrons
As protons and neutrons are present in the nucleus of the atom which is a conserved zone and does not participate in any kind of chemical reaction. It’s only the electrons which decide the type or the number of bonds formed by an atom.

46. Plant.
It has to be a plant cell because animals cells (from any tissue whether liver or lungs) does not have a cell wall. Bacterial cells have cell wall but they don’t have a well-defined nucleus only nucleoid region is present in bacteria.

47. All of the above.
Gene pool is sum total of all genes or genetic information a particular species of a population have. So migration can cause addition or deletion of some gene from the gene pool due to entry or leaving of new members in the population. Similarly genetic drift can also cause changes in gene pool by causing some variants of particular gene to disappear from the population. Whereas mutation can straight forwardly change the gene pool by alteration in gene and natural selection can cause disappearance of any undesired gene causing gene pool to change.

48. Sexual reproduction increases the variation in the genetic material of a population, enabling evolution to occur more quickly.
Variation or Diversity is an important phenomenon driving evolution. Sexual reproduction provides this variation easily. As both the parents contribute a set of gene to the off spring through gametes which are formed by genetic recombination. So all offspring can have a different genetic combination and the best traits can be selected and passed on to the coming generations through natural selection, facilitating evolution.

49. All of the statements about DNA are TRUE.
As DNA is the genetic material and is passed from one generation to other, thus it is the medium through which genetic information is inherited to the next generation. DNA is transcribed into RNA which is then translated into proteins, so yes, ultimately it’s the DNA that contains the coded direction for making proteins. And the two antiparallel strands of DNA are held together by pairing interaction between complimentary bases and interaction is hydrogen bonding.

50. Sugar
DNA is basically made up of three components:

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