Which soil horizon is composed of organic
litter?
a. A
b. B
c. C
d. D
e. E
A
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Which term refers to an individual with identical alleles of a particular gene?
a. Genotype b. Heterozygous c. Homozygous d. Gene e. Phenotype
Which of the following is the largest lymphoid organ, and filters pathogens, worn-out red blood cells, and platelets from blood vessels?
a. spleen b. thymus gland c. lymph nodes d. tonsils
The simple tissue composed of dead, thick-walled cells that provide structural support to plants is referred to as ____
a. vascular b. dermal c. collenchyma d. sclerenchyma e. parenchyma
What factors have been shown to mark a protein as short-lived?
a) All of the choices are correct. b) a lysine at the N-terminus of the protein c) the phosphorylation of certain residues in proteins that act at specific times within the cell cycle d) proteins that carry a degron, a specific, internal amino acid sequence that ensures their destruction