Which component is present in some viruses but absent in others?

A.) nucleic acid

B.) capsid

C.) envelope

D.) cell membrane

In which of the following periods of the Paleozoic Era did the first vascular plants appear on land? A. Silurian B. Permian C. Cambrian D. Ordovician

What are alleles? different genes same genes different types of a genes

What kind of atom tends to lose one electron? A. an atom with a single electron in its outermost shell B. an atom with a full outermost shell C. an atom with seven electrons in its outermost shell D.

12In an experiment, a petri dish with a colony of bacteria is exposed to cold temperatures and then warmed again. Find a quadratic model for the data in the table. Type your answer below. Show your work.

A cell a. can be composed of many types of tissues. b. is found only in plants and animals. c. is the smallest entity studied by biologists. d. may be a distinct entity or a building block of a more complex organism.

Which structures could most likely be observed in cells in the low-power field of a compound light microscope?

If severe brain loss occurs before age 60, then it is usually due to drug abuse, poor circulation, viruses, and genes, not the result of normal aging. Thus, this is disease connected or: Deductive Vocational Metabolic Pathological

When enzyme action stops due to a build up of end product, this control is called ... ?

A pharmaceutical company is promoting a new estrogen skin patch for birth control. They say it is better because a woman only wears the patch for one week and then wears no patch for three weeks. Explain the logic behind this proposal.

Select the correct statement about nephrons. A. Podocytes are the branching epithelial cells that line the tubules of the nephron. B. Filtration slits are the pores that give fenestrated capillaries their name. C.