Sister chromatids begin attaching to spindle fibers during which phase?
a. prophase
b. prometaphase
c. metaphase
d. anaphase
b. prometaphase
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Polyploidy in plants
A. is very common. B. allows for adaptation to diverse environments. C. may alter the levels of gene expression. D. allows humans to create plants with unusual flowers. E. All of these statements are true regarding polyploidy in plants.
Which of the following is (are) NOT true concerning
glandular epithelium? a. Gland cells occur in it. b. It is found in locations other than glands. c. It secretes products unrelated to its own metabolism. d. Its products are distributed only locally. e. All of these are NOT true.
If a protein is supposed to consist of the amino acid sequence valine-valine-histidine and instead it consists of the sequence alanine-valine-histidine, most likely
A. there has been a point mutation in the first codon. B. there has been a point mutation at the eighth base pair. C. the change will not be noticed. D. this is a gross mutation; the organism will not survive.
Which of these associations is incorrect?
Select one: a. epidermal cell--protection b. stomata--gas exchange c. sclerenchyma cells--cell division d. sieve-tube members--sugar transport e. xylem cells--water transport