Which structure causes the lens to bend or relax enabling an individual to focus on objects that are near or far?
a. Sclera
b. Retina
c. Ciliary muscles
d. Cornea
e. Pupil
c
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An example of a haploid cell is a
A. All of the answer choices are correct. B. skin cell. C. zygote. D. stem cell. E. sperm cell.
About twelve to twenty-four hours after the previous meal, a person's blood-sugar level normally varies from 60 to 90
milligrams per 100 milliliters of blood, though it may rise to 130 mg/100 ml after meals high in carbohydrates. That the blood-sugar level is maintained within a fairly narrow range despite uneven intake of sugar is due to the body's ability to carry out
a. adaptation. b. inheritance. c. metabolism. d. homeostasis.
e. evolution.Systolic pressure is
a. the lowest blood pressure in the aorta. b. the pressure measured when the left ventricle is relaxed. c. the peak pressure in the aorta when the left ventricle contracts. d. the difference between the highest and lowest pressures. e. an average of high and low pressures.
What is required for the transposition of a retrotransposon? Select all that apply.
A. integrase B. transposase C. reverse transcriptase D. RNA polymerase