Other than the proteins that they encode, what is a major difference between cell-specific genes and
housekeeping genes? (PPE = promoter proximal element)
a. Cell-specific genes are expressed only in a single cell type; housekeeping genes are
expressed in all cell types.
b. Cell-specific genes have PPEs and enhancers; housekeeping genes have only PPEs.
c. Cell-specific genes have PPEs that use specific activators; housekeeping genes have
"universal" activators for their PPEs.
d. Cell-specific genes are only found in certain cell types; housekeeping genes are found in
all cell types.
e. Cell-specific genes have PPEs that use "universal" activators; housekeeping genes have
C
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A single motor neuron and the population of muscle fibers that it innervates is called the:
A. motor unit. B. motor endplate. C. neuromuscular junction. D. excitation-contraction coupling. E. twitch fiber.
Answer the following statements true (T) or false (F)
1. A recessive allele is one that is masked if a dominant allele is also present. 2. The most common allele for any trait is always the dominant allele. 3. Genotypes are the outward expression of an allele combination. 4. Mendel's law of segregation states that the two alleles of each gene are packaged into separate gametes. 5. Any dihybrid cross should theoretically yield a 3:1 phenotypic ratio.
Leprosy is caused by a microbe of the genus ________.
A. Mycobacterium B. Streptococcus C. Chlamydia D. Staphylococcus
Which of the following supports a detrital food web?
a. dead or decaying organisms b. photosynthetic organisms c. living autotrophs d. phytoplankton