Describe the composition of a nucleosome.

What will be an ideal response?


A DNA molecule wrapped around a spool of histones.

Biology & Microbiology

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In adaptive immunity, pathogen specific receptors are produced in large numbers only after exposure to the pathogen or its products

Indicate whether the statement is true or false.

Biology & Microbiology

If the efficiency of the alveoli in an human was reduced by 50%, what would you predict would be the effect?

A. The volume of air in the lungs would decrease by 50%. B. The affinity of hemoglobin for oxygen would decrease by 50%. C. The rate of gas exchange would decrease by 50%. D. The muscular control of breathing would decrease by 50%.

Biology & Microbiology

Human Hox genes are in four clusters: HOXA, HOXB, HOXC, and HOXD, for a total of 39 genes. Besides conserving the clustering of genes, evolution has also conserved __________

A) their chromosomal locations B) the order of the genes within them C) their expression along the dorsal-ventral axis D) the mutations to which they give rise E) their bilateral symmetry

Biology & Microbiology

The kidneys excrete metabolic wastes, including urea, a by-product of glucose metabolism.

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

Biology & Microbiology