A true breeding black rabbit is crossed with a true breeding white rabbit. If the black color trait is dominant, which of the following represents the expected phenotype of an F2 generation consisting of 8 individuals?
A. 8 black rabbits, 0 white rabbits, 0 grey
rabbits
B. 2 black rabbits, 2 white rabbits, 4 grey
rabbits
C. 0 black rabbits, 0 white rabbits, 8 grey
rabbits
D. 4 black rabbits, 2 white rabbits, 2 grey
rabbits
E. 6 black rabbits, 2 white rabbits, 0 grey
rabbits
E
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All of the following are critical factors for DNA replication on the leading strand EXCEPT?
A. primer B. DNA ligase C. DNA polymerase D. DNA primase E. deoxynucleoside triphosphates
Many men make antibodies to sperm, resulting in destruction of sperm to the point of sterility. What would be the likely origin of this autoimmune disease?
A. These antibodies are produced as a result of mutations in T lymphocytes, causing them to make large amounts of antibody. B. Antigens on sperm cells are similar to antigens on a variety of bacteria like Streptococcus. After a strep throat caused by Streptococcus, the immune system produces antibodies to streptococcal antigens, which then cross react with sperm antigens and destroy them. C. Since sperm are not made until after puberty, the immune system cannot scan the antigens on the sperm for immune tolerance. After sperm are made and the immune system sees them, they are recognized as foreign. D. T helper cells erroneously identify sperm cells as foreign invaders, triggering the T cytotoxic cells to start killing sperm.
Select the reduced molecule:a
NAD+ b. FAD c. NADH d. H? e. NADP+
In the cell cycle, controlled degradation of regulatory proteins occurs via the
A) P450-protease pathway. B) cyclin-Cdk pathway. C) ubiquitin-proteasome pathway. D) kinase inhibition pathway. E) PI3K-Akt pathway.