Which of the following is not true of signal integration by more than one transcription factor?
A. It occurs in both bacteria and eukaryotes.
B. It allows for multiple environmental signals to control the expression of a single gene.
C. It is used to control the expression of genes in opposite orientations that are controlled by the same promoter.
D. It can include the use of both repressors and activators at the same promoter.
C
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The hormonal methods of birth control that are long-acting and not user-dependent include:
(Check all that are true) [A] Vaginal Ring [B] Progestogen-only pills [C] The "patch" [D] Birth control implants [E] Birth control injections [F] Combined oral contraceptives [G] Copper intrauterine devices
A food web is a more realistic depiction than a food chain because:a
organisms rarely eat just one kind of food. b. energy flow is linear. c. energy flow is cyclic. d. a more complex model is always better than a simple one. e. matter cycles in ecosystems
The main steps of the nitrogen cycle are:a
nitrogen fixation, nitrification, assimilation, digestion, and denitrification. b. nitrigenation, nitrification, assimilation, ammonification, and denitrification.
c. nitrogen fixation, nitrification, assimilation, ammonification, and dinitrification. d. nitrogen fixation, nitrification, assimilation, carbonation, and denitrification. e. nitrogen fixation, oxidation, assimilation, ammonification, and denitrification.
Why is cartilage important in sharks, rays, and skates?
A) it works as a respiratory structure B) it circulates blood flow C) it supports and gives structure D) it helps with digestion