4
Q:

Flowers in which polllination takes place by insect their pollen grains are ________

A) Smooth and dry B) Rough and sticky
C) Rough and dry D) Large in Size

Answer:   B) Rough and sticky



Explanation:
Subject: Biology
Q:

Who discovered the monomers of nucleic acids?

A) James Watson, Francis Crick, and Rosalind Franklin B) Friedrich Miescher
C) Phoebus Levene D) Gerardus Johannes Mulder and Jöns Jacob Berxelius
 
Answer & Explanation Answer: C) Phoebus Levene

Explanation:

Deoxyribonucleic acid (DNA) is a nucleic acid polymer composed of monomers called nucleotides. Nucleotides are composed of three components: (1) a pentose sugar; (2) a nitrogenous base; and (3) one to three phosphate groups.

Phoebus Levene, a Russian biochemist was the first to discover the nucleotide and the first to correctly identify the way nucleic acid molecules, DNA.

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Q:

During the sensorimotor stage the main task is to

Answer

Jean Piaget was a cognitive psychologist who identified four stages of development: the sensorimotor stage from birth to 2 years, the preoperational stage from age 2 to age 7, the concrete operational stage from age 7 to 11, and the formal operational stage from age 11 to adult. He identified milestones that occur at each stage.


 


According to Piaget, the main task of the sensorimotor stage is for the child to learn the concept of object permanence, use senses and motor skills to understand the world.

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Q:

Secondary consumers are eaten by larger

A) fast animal B) animal in the third trophic level
C) herbivorous animal D) predator
 
Answer & Explanation Answer: D) predator

Explanation:

A tertiary consumer is an animal that obtains its nutrition by eating primary consumers and secondary consumers.

Usually tertiary consumers are carnivorous predators, although they may also be omnivores, which are animals that feed on both meat and plant material.

 

Tertiary consumers often occupy the top trophic level, and so are predated by no other animals; in this case they are called "apex predators". However, when they die their bodies will be consumed by scavengers and decomposers.

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Q:

What happens during the process of translation?

A) Transfer RNA is made from messenger RNA B) Copies of DNA molecules are made
C) The cell uses information from messenger RNA to produce proteins D) Messenger RNA is made from DNA
 
Answer & Explanation Answer: C) The cell uses information from messenger RNA to produce proteins

Explanation:

Translation is the process by which a protein is synthesized from the information contained in a molecule of messenger RNA (mRNA). During translation, an mRNA sequence is read using the genetic code, which is a set of rules that defines how an mRNA sequence is to be translated into the 20-letter code of amino acids, which are the building blocks of proteins.

 

In short, during the process of translation source language text is conveyed to destination language.

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Q:

Cellular respiration is best associated with the

A) microtubule B) ribosome
C) Golgi apparatus D) mitochondrion
 
Answer & Explanation Answer: D) mitochondrion

Explanation:

Cellular respiration is best associated with the organelle Mitochondrion.

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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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