An enveloped virus is dependent on the envelope for its ability to infect a host cell. which virus most likely uses this mechanism?
hiv
polio
rabies
ebola

The right answer is HIV virus.

The HIV has on its surface about twenty trimers gp120 / gp41 (on its envelope) which will be used for the attachment of the virus on a cell receptor (CD4) of the target cells. These two proteins are encoded by the same gene (Env) and are synthesized as a precursor which will be glycosylated (addition of sugars) and cleaved by a protease.

Fixation of the trimer to the CD4 receptor induces a conformational change in the gp120 protein, which will increase its affinity for cellular coreceptors (CCR5 or CXCR4). Again, a conformational change occurs on the gp41 protein, which will allow the fusion of the virus and cell membranes.

the answer is admiramos

the rule for verbs is whoever you are referring to (in this case 'nosotros'), you need to change the ending of the word.

nosotros - amos

yo - o

tu - as

el, ella, usted - a

ellos, ellas, ustedes - an

(examples: nosotros bailamos (instead of bailar) or yo hablo (instead of habla)

a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

no u