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3 years ago

Which statement about the immune system is false?

Biology

2 answers:

lora16 [44]3 years ago

5 0

D. wbc are not made in lymph nodes, wbcs are typically made in bone marrow and the thymus gland

anygoal [31]3 years ago

5 0

White blood cells are made in lymph nodes is wrong about the immune system.

Option D

<u>Explanation</u>:

White blood cells are made from the hematopoietic progenitor cells inside the bone marrow after that they are transferred through the blood circulation and seeps out along with the lymph into the lymph nodes. Inside the lymph nodes the white blood cells are exposed to the foreign antigens or toxic proteins from which they get their specificity and antigenic maturity. White blood cells like B cells are present in bone marrow while T cells are present in thymus and moved to the lymph node for maturation.

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Which of the following is NOT a function of the digestive system?

fenix001 [56]

Answer:

D. elimination of digestible wastes.

Explanation:

Digestion is the breakdown of large food components into smaller size in the body.

The digestive system functions includes the chemical breakdown of food, mechanical breakdown of food, absorption of food molecules and elimination of waste products.

The digestive tract can be compare to a tube with two openings - mouth and anus. The process of digestion starts from the mouth ( ingestion of food) through the oesophagus down to the stomach (where the food is mixed with digestive juices) then to the small intestine (this is where most of the digestion process takes place) then to the large intestine and finally to the anus where undigested wastes are eliminated

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3 years ago

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Which of the following are considered bases in the DNA molecule? (There are 4 correct answers)

AleksandrR [38]

Adenine Thymine Cytosine Guanine

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4 years ago

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How does the phrase "the mellow gleam of the musing moon” contribute to the poem’s meaning?

polet [3.4K]

<span>It uses personification to convey that nature imparts joy and wisdom.

</span>

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3 years ago

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A sample compound with a molar mass of 34.00g/mol is found to consist of 0.44g H and 6.92g O. Calculate both empirical and molec

ipn [44]

Answer:

Empirical: OH

Molecular: $H_{2} O_{2}$

Explanation:

First of all, we are going to use the formula: mass = no. moles x Molar Mass And rearrange it to find No. moles: No. moles = mass/Molar Mass

Let's start with Hydrogen:

The given mass is 0.44g, and hydrogen's molar mass is 1.01, therefore the number of moles is: 0.44/1.01 = 0.4356

Now we do the same for Oxygen:

Given mass = 6.92, Molar mass of Oxygen = 16.00, No. Moles = 6.92/16.00 = 0.4325

Now we identify the smaller one (Oxygen as 0.4325 < 0.4356) and we divide both values by that number:

0.4325/0.4325 = 1

0.4356/0.4325 = 1.01

We round both to the nearest 0.2 or 0.25 (depending on what you're taught), and we get: 1 and 1.

This means that the empirical formula has one of each: OH

Now to find the molecular formula we find the relative mass of OH and divide the given mass by that:

M(OH) = 16.00+1.01 = 17.01

34.00/17.01 = 2

We now multiply both by this number to get:

$H_{2} O_{2}$

Hope this helped!

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