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marusya05 [52]
3 years ago
6

The immune system is the body's defense against disease. White blood cells, or lymphocytes, are one type of immune system cell.

Which of the following immune system cells make markers that tag invading pathogens for later destruction?
a.helper T cells
b.cytotoxic T cells
c.macrophages
d.B cells
Biology
1 answer:
Novosadov [1.4K]3 years ago
6 0

b) cuz(my instinct says so)

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Once a hypothesis is tested and confirmed, and then tested again and confirmed again by many others, it may provide the basis fo
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theory

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Explain the purpose of the placenta and describe how a fetus gets its nutrients.
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Answer:

The placenta is the temporary association of fetus and maternal tissue. It is meant for nutrition and transport of different substances.

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7 0
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Which two codons in the mRNA represent the amino acid phenylalanine
Trava [24]

Answer:

UUU and UUC

Explanation:

Information that encodes certain functional products called PROTEIN are present in the DNA molecule. However, the information needs to be expressed via the processes of transcription and translation. Transcription is the synthesis of a mRNA using a DNA template.

The mRNA then undergoes translation, where it is read in a group of three nucleotides called CODON. Each CODON specifies a particular amino acid. Due to the degenerate nature of the genetic code, more than one codon can specify one amino acid.

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Answer:

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