Certain metabolic pathways are affected by the buildup of a product which interacts with an enzyme catalyzing one of the initial steps of the pathway; this can be an example of

(A) transcriptional regulation
(B) thermodynamic regulation
(C) translational regulation
(D) feedback inhibition
(E) posttranslational modification


Ans: (D) feedback inhibition

Biology & Microbiology

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The genotypic ratio produced in the last cross is most likely  

A secretor (allele seS) is a person who secretes their blood type antigens into body fluids such as saliva. By comparison, a non-secretor (allele seNS) does not. A person's status as a secretor or non-secretor is independent of blood type. Consider the following inheritance pattern of this trait:



A.  3:1
B.  1:2:1
C.  2:1
D.  9:3:3:1
E.  1:1

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Biology & Microbiology

There are three alleles controlling the ABO blood types. IA and IB are codominant genes so that the

combination IAIB produces the AB blood type. The third allele, IO, is recessive to the other two alleles. Indicate which of these parents could produce the given child:Parents Child Yes or No (a) A ? AB B (b) A ? O A (c) A ? B O (d) A ? AB O (e) A ? AB B (f) B ? B O Observing Patterns in Inherited Traits 115 (g) AB ? AB A What will be an ideal response?

Biology & Microbiology

In club fungi, each club-shaped cell initially

a. is a spore. b. is a zygote. c. contains a single nucleus. d. is dikaryotic. e. undergoes mitosis to produce spores.

Biology & Microbiology

The newest issue of your favorite science magazine has an article about several recently discovered archaeans. These organisms were found living in swamp mud. Based on this information, these archaeans are probably halophiles.

Answer the following statement true (T) or false (F)

Biology & Microbiology