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Q:

The insects do not have blood pigments because 

A) there is no blood B) blood does not have a respirratory function
C) tissues have pigments D) pigments are elsewhere

Answer:   B) blood does not have a respirratory function



Explanation:

The blood of some invertebrate animals like the earthworm is red due to haemoglobin pigment, but the pigment is dissolved in the plasma. In vertebrates the same pigment is found in the red corpuscles and not in the plasma.

Subject: Biology
Q:

What prevents food from entering the windpipe?

A) Epiglottis B) Pharynx
C) Trachea D) Larynx
 
Answer & Explanation Answer: A) Epiglottis

Explanation:

Epiglottis is that prevents food from entering the windpipe. 

It is a cartilageous flap that flaps opens and closes when swallowing. When you swallow, the epiglottis flattens backward to cover the entrance to your larynx and prevent food from entering the lungs and windpipe. The epiglottis returns to its usual position after swallowing.

 

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Q:

What kingdom does Amoeba belong to

A) Plantae B) Protista
C) Monera D) Prokaryotae
 
Answer & Explanation Answer: B) Protista

Explanation:

The Amoebas belong to a group called Protista.

Amoebas are of the animal kingdom subdivision for microscopic organisms - protozoa.

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Q:

Chylomicrons are synthesized within the

A) Intestinal cells B) Liver
C) Storage compartment of plant seeds D) Lymphatic system
 
Answer & Explanation Answer: D) Lymphatic system

Explanation:

Lipoproteins are particles that contain triacylglycerol (TAG), cholesterol, phospholipids and amphipathic proteins called apolipoproteins.

 

The four major types of lipoproteins are

1. chylomicrons,

2. very low-density lipoprotein (VLDL),

3. low-density lipoprotein (LDL), and

4. high-density lipoprotein (HDL).

 

Chylomicrons are formed in the endoplasmic reticulum in the absorptive cells (enterocytes) of the small intestine.

 

The function of these lipoproteins is to deliver energy-rich triacylglycerol (TAG) to cells in the body (pink pathway). TAG is stripped from chylomicrons and VLDL through the action of lipoprotein lipase, an enzyme that is found on the surface of endothelial cells. This enzyme digests the TAG to fatty acids and monoglycerides, which can then diffuse into the cell to be oxidized, or in the case of an adipose cell, to be re-synthesized into TAG and stored in the cell.

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Q:

Which of the following is an endocrine gland?

A) Mammary glands B) Apocrine sweat glands
C) Reproductive glands D) Salivary glands
 
Answer & Explanation Answer: C) Reproductive glands

Explanation:

Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct.

 

The major glands of the endocrine system include:

pineal gland,

pituitary gland,

pancreas,

ovaries,

testes,

thyroid gland,

parathyroid gland,

hypothalamus and

adrenal glands.

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Q:

Gluconeogenesis is a term that describes the synthesis of

Answer

Gluconeogenesis is a metabolic pathway that leads to the synthesis of glucose from pyruvate and other non-carbohydrate precursors, even in non-photosynthetic organisms.


 


It occurs in all microorganisms, fungi, plants and animals, and the reactions are essentially the same, leading to the synthesis of one glucose molecule from two pyruvate molecules. Therefore, it is in essence glycolysis in reverse, which instead goes from glucose to pyruvate, and shares seven enzymes with it.

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0 19
Q:

Which of the following occurred in the presence of tetrodotoxin?

A) The number of action potentials decreased. B) The size of the action potential increased.
C) The number of action potentials increased. D) The size of the action potential decreased.
 
Answer & Explanation Answer: A) The number of action potentials decreased.

Explanation:
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Q:

Which of the following is an abnormal constituent of urine?

A) Creatinine B) Uric acid
C) Glucose D) Urea
 
Answer & Explanation Answer: C) Glucose

Explanation:

Normally, urine contains water and wastes, such as urea, uric acid, creatinine, and some ions. However, some of these substances may be abnormally elevated, which usually indicates that something is wrong with the body.

 

The following are some of the abnormal constituents of urine::

Albumin

Bilirubin

Glucose

Ketone bodies

Blood

Microbes

White blood cells

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Q:

Nitrogenous bases in DNA and RNA?

A) Adenine B) Cytosine
C) Guanine D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

Nitrogenous base: A molecule that contains nitrogen and has the chemical properties of a base.

 

DNA and RNA ::

 

The nitrogenous bases in DNA are

Adenine (A),

Guanine (G),

Thymine (T), and

Cytosine (C).

 

Whereas the nitrogenous bases in RNA are the same, with one exception:

Adenine (A),

Guanine (G),

Uracil (U), and

Cytosine (C).

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