The ascending limb of the nephron loop
A) is permeable to salt.
B) is permeable to water.
C) is the primary site of tubular secretion.
D) pulls salt from the renal medulla to make the filtrate more concentrated.
E) responds to high levels of ADH in the blood.
A
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Some species of cyanobacteria can fix atmospheric nitrogen.
Answer the following statement true (T) or false (F)
A SNP that can exist as a C or G is associated with a human disease. The genotypic odds ratio of the homozygote CC relative to the homozygote GG is 2.2, which indicates that
A) both CC and GG individuals are equally likely to get the disease because 2.2 is not a significant value. B) heterozygotes are 2.2 times as likely to get the disease as GG homozygotes. C) CC homozygotes are 2.2 times as likely to get the disease as GG homozygotes. D) CC homozygotes are 2.2 times less likely to get the disease as GG homozygotes.
Which of the following organisms is used in
the genetic engineering of plants?
a. E. coli b. T. aquaticus c. A. tumefaciens d. P. flourescens e. B. thuringiensis
Why is penicillin ineffective against gram-negative bacteria?
a. Penicillin is not toxic to gram-negative bacteria. b. Penicillin is pushed away from the cell membrane by the fimbriae. c. Gram-negative bacterial do not have receptors for penicillin to attach to. d. Gram-negative bacteria do not have channels or pores in its membrane for penicillin to pass through. e. Penicillin cannot reach the thin peptidoglycan layer easily because it is protected by the bacteria’s outer membrane.