How do histones bind to DNA?
a. by an ionic attraction to the nitrogenous bases of DNA
b. by hydrogen bonding with the nitrogenous bases of DNA
c. by hydrogen bonding to the deoxyribose sugars of DNA
d. by an ionic attraction to the phosphate groups of DNA
Answer: d. by an ionic attraction to the phosphate groups of DNA
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Indicate whether each statement is true or false and then provide the explanation for why the statements are either true or false. A specific signaling molecule may bind to receptors on more than one kind of cell
What will be an ideal response?
Currently, taxonomic domains include ____
a. Kingdom, Phylum, Class, and Species b. Plantae, Animalia, Fungi, Protista, and Monera c. Archaea, Bacteria, Eukarya d. Mammalia, Insecta, Aves, and Plantae e. North America, South America, Eurasia, Africa, and Australia
In the ovarian cycle, the pituitary gland releases ____
a. estrogen and estradiol b. progesterone only c. progesterone and inhibin d. follicle-stimulating hormone (FSH) and luteinizing hormone (LH) e. gonadotropin-releasing hormone
An immune system cell called the plasma cell produces thousands of antibodies (a type of protein) per second for release into the body. What type of intracellular structure would you expect to be very prominent within the cell?
A) the smooth endoplasmic reticulum B) the rough endoplasmic reticulum C) peroxisome D) microtubules