Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell?

A. Lysozymes

B. Perforin

C. Cytokines

D. Granzymes

Answer Explanation:

Cytokines are small proteins that act as chemical messengers between different types of immune cells. They can stimulate or inhibit the activation, proliferation, differentiation, and migration of immune cells. For example, interleukins are a type of cytokine that is produced by one type of white blood cell and can affect the behavior of another type of white blood cell. Lysozymes, perforin, and granzymes are all molecules that are involved in killing pathogens or infected cells, but they do not directly activate other immune cells.

Therefore, the Correct Answer is C.

Q #1: Which of the following is the main function of centrosomes in animal cells?

A. Organelle trafficking

B. Pathogen digestion

C. Microtubule organization

D. Cytoplasm formation

Answer Explanation

Centrosomes are small structures that are found near the nucleus of animal cells. They consist of two centrioles that are surrounded by a protein matrix called the pericentriolar material. The main function of centrosomes is to organize the microtubules, which are long, hollow tubes that form part of the cytoskeleton. Microtubules are involved in many cellular processes, such as cell division, cell movement, and intracellular transport. Centrosomes act as the main microtubule-organizing centers (MTOCs) in animal cells, meaning that they nucleate and anchor the microtubules
Q #2: Which of the following is the process in which an ovarian follicle matures and releases a reproductive egg?

A. Oogenesis

B. Ovulation

C. Menstruation

D. Fertilization

Answer Explanation

The process in which an ovarian follicle matures and releases a reproductive egg is called ovulation. Ovulation is one of the phases of the menstrual cycle, which also includes follicular phase, luteal phase and menstruation
Q #3: Lithium has an atomic number of 3 and a mass number of 7. Which of the following is the number of protons in a lithium atom?

A. 12

B. 3

C. 4

D. 7

Answer Explanation

The number of protons in an atom is equal to its atomic number. In this case, lithium has an atomic number of 3, so it contains 3 protons.

The other choices (A, C, and D) do not represent the correct number of protons for a lithium atom.

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Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell?

More Questions on TEAS 7 Science

Q #1: Which of the following is the main function of centrosomes in animal cells?

Answer Explanation

Q #2: Which of the following is the process in which an ovarian follicle matures and releases a reproductive egg?

Answer Explanation

Q #3: Lithium has an atomic number of 3 and a mass number of 7. Which of the following is the number of protons in a lithium atom?

Answer Explanation

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