Which of the following statements about double fertilization in angiosperms is correct?
A) One pollen grain combines with the egg to form the zygote, and one pollen grain combines with the polar nuclei to form endosperm. Two sperm combine with a polar nucleus to form endosperm.
B) Two pollen grains combine with two ovules to form the zygote and endosperm.
C) One sperm combines with the polar nuclei to form the zygote, and one sperm combines with the egg to form endosperm.
D) One sperm combines with the egg to form the zygote, and one sperm combines with the polar nuclei to form endosperm.
Answer: D
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With exponential growth, ____
a. r is always greater than zero b. growth occurs although r can be zero c. the number of new individuals added increases each generation, and r is stable and less than one d. the number of new individuals added increases each generation, and r is stable and greater than one e. the number of new individuals added increases each generation and r increases
The common ancestor of all animals was probably most like a:
1.Slime mold 2.Dinoflagellate 3.Choanoflagellate 4.Ciliate
What type of RNA carries amino acids to the ribosome?
A. complementary RNA B. messenger RNA C. ribosomal RNA D. double-stranded RNA E. transfer RNA
What statement about deuterostomes is false?
A. Their anus forms first during gut development. B. The group includes arthropods. C. They are a paraphyletic group. D. The group includes chordata. E. Both A and C F. Both B and C G. Both A and B