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3 years ago

Scientists believe that Homo neanderthalensis appeared about

Biology

1 answer:

givi [52]3 years ago

4 0

Answer:

a. 200,000 years ago.

Explanation:

Scientists believe that Homo neanderthalensis appeared about 200,000 years ago. The name Homo neanderthalensis was given to them because first evidence of their existence was found in Germany near Neander Tal. Their period of existence is part of the Pleistocene period and they are considered as the immediate ancestors of modern humans (Homo Sapiens).

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2. How do the effects of insulin resistance compound to decrease cellular responses to insulin?

victus00 [196]

Answer and explanation;

-The insulin receptor itself has decreased kinase activity leading to fewer binding sites for singling effectors to become activated.

Therefore; the signaling effectors are less likely to be activated.

-Additionally,, feedback inhibition decreases signaling effector binding to receptor.

-The lack of activation of these initial signaling effectors prevents any subsequent steps from happening.

-We can thus conclude this by saying that higher insulin concentrations are necessary to obtain the same level of signaling leading to physiological effects that would exist in someone without type-2 diabetes.

-Also the requirement for higher insulin concentration means that the cells that respond to insulin are resistant to its effect.

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3 years ago

Read 2 more answers

Match the biological structure with its metaphorical equivalent Question 5 options: Movie Authors Words Chapter variations Scrip

liberstina [14]

1. Nucleotides: A phosphate group, a 5-carbon sugar, and a nitrogenous base are the three components of a nucleotide. Adenine, cytosine, guanine, and thymine are the four nitrogenous bases in DNA. Instead of thymine, uracil is found in RNA. The genetic material of all known living creatures is made up of nucleotides in a chain.

2. Genes: A gene is a small segment of a lengthy DNA double helix molecule that consists of a linear base pair sequence. A gene is any portion of DNA that contains instructions that allow a cell to generate a specific product – usually a protein, such as an enzyme – that performs a single specified action.

3. A locus (plural loci) is a stable location on a chromosome where a certain gene or genetic marker can be found.

4. At a genomic region, an allele is one of two or more variations of DNA sequence (a single base or a segment of nucleotides).

5. Chromosomes are thread-like structures found within the nucleus of both animal and plant cells. Protein and a single molecule of deoxyribonucleic acid make up each chromosome (DNA). DNA is passed along from parents to children and carries the precise instructions that distinguish each living thing.

6. Karyotype: A karyotype is a individual's entire set of chromosomes. A laboratory-produced representation of a person's chromosomes extracted from an individual cell and arranged in numerical order is also known as a chromosomal map. A karyotype can be used to check for chromosomal number or structural problems.

8. Genotype: An organism's genotype is its genetic makeup. From embryonic development to adulthood, the genotype determines an individual's inherited potentials and limitations. In se×ually reproducing organisms, a person's genotype is made up of the whole set of genes acquired from both parents.

9. Phenotype: Physical traits are described by phenotypes. It encompasses both apparent (such as hair or eye color) and measured characteristics (like height or weight). Characteristics relevant to your development and behavior, such as personality traits, are also referred to as phenotypes.

For more information regarding genotype, visit:

brainly.com/question/22117

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4 0

2 years ago

Question 1 of 10

Sati [7]

Answer: Option A) Parathyroid glands

Explanation:

The Parathyroid gland located in the neck region helps in the secretion of an hormone called Parathormone.

This hormone helps to raise the levels of calcium ions in the body, by preventing the loss of calcium ions through urine, and also preventing excess deposit of calcium ions in the bone, thus regulating bone density.

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3 years ago

Fungi cannot make their own food through photosynthesis. How do they take in nutrients ? A.Absorbing sunlight B.producing spores

erma4kov [3.2K]

Answer:

Fungi take in nutrients by C. absorbing nutrients. They suck up nutrients from decomposing matter.

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3 years ago

Read 2 more answers

An animal that is endothermic and homoeothermic A. uses metabolic energy to regulate its body temperature and maintains a relati

rusak2 [61]

Answer: The correct option is A (uses metabolic energy to regulate its body temperature and maintains a relatively constant body temperature).

Explanation:

HOMOEOTHERMIC animals are also called endothermic animals. They are the warm blooded animals which uses heat energy generated metabolically to regulate and maintain a relatively constant body temperature. Examples of animals that are endothermic include the birds and mammals.

The temperature which they maintain is deep inside the body and not the skin temperature.

Also the temperature of a body is affected by the heat it gains and losses. The body gains heat mainly:

--> by absorbing it from its surroundings

--> from the heat released during the catabolic reaction that occur all the time in the body cells.

--> by conduction, convection and radiation from the surface of the body

--> through evaporation, especially of sweat and

--> in the air that is exhaled and urine that leaves the body.

Under normal circumstances, the heat the body gains is balanced by the heat it loses. A RISE in body temperature stimulates the following processes to get rid of excess body heat:

--> A decrease in metabolic rate: the body slows down its activities to decrease the metabolic rate. This reduces the heat released by metabolic reactions, hence minimizing heat production within the body.

A FALL in body temperature stimulates the following processes to produce and conserve heat:

--> increasing metabolic rate: The body increases its metabolic rate, especially that of the liver, to produce more heat

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3 years ago