The amniotic egg first appeared in which group of animals?
A) reptiles B) amphibians C) mammals D) birds
Answer: A
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The teeth designated by the letter “A” in the above
figure are called a. canines. b. premolars. c. incisors. d. molars. e. none of these.
The procedure by which embryos produced during in vitro fertilization are tested for defects is called
a. chorionic villus sampling. b. preimplantation diagnosis. c. amniocentesis. d. fetoscopy. e. senescence.
The endosperm of a plant ____.
A. is the food supply for the new sporophyte plant B. is composed of haploid tissue C. protects the young embryo within a seed D. provides a connection between the ovary of a flower and a developing seed E. produces sperm cells
Which of the following statements concerning enzymes is false?
A) They can carry out hundreds of chemical transformations per second. B) Many activities in living organisms require multiple enzymes. C) One enzyme will work on many different substrate molecules to produce many different products. D) They accelerate the rate of chemical reactions.