If we think of the DNA double helix as a twisted ladder, what makes up the rungs or steps of the ladder?
A. phosphate groups and bases
B. alternating phosphate groups and sugars
C. phosphate groups only
D. purines and pyrimidines
E. sugars only
Answer: D
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Most animal hormones _____
A) are produced by endocrine glands B) are lipid-soluble molecules C) are carried to target cells in the blood or hemolymph D) are protein molecules E) elicit the same biological response from all of their target cells
The RNA "alphabet" used in the genetic code has ____ letters
a. 5 b. 64 c. 4 d. 20 e. 3
Which cell cycle checkpoint occurs between metaphase and anaphase to check for proper spindle attachement to the chromosomes?
A) G2 check point B) G1 check point C) mitotic checkpoint
Relative to chromosome numbers, hybridization can produce speciation in two ways. What are they?
What will be an ideal response?