BIOLOGY HIGH SCHOOL

How does the nicotine from cigarette smoking disrupt oxygen distribution to the cells? >It restricts air flow through the bronchi.
>It reduces the surface area of alveolar sacs.
>It binds to hemoglobin in red blood cells.
>It affects the nerve signals that regulate breathing.

Answers

Answer 1
Answer:

The study of cells is called cell biology. There are two different types of cells on the basis of the number and these are unicellular and multicellular.

The correct answer to the question is option D that is It affects the nerve signals that regulate breathing.

What is nicotine?

  • Nicotine is a naturally produced alkaloid in the nightshade family of plants and is widely used recreationally as a stimulant and anxiolytic.
  • As a pharmaceutical drug, it is used for smoking cessation to relieve withdrawal symptoms

According to the question, the nicotine present in the cigarette binds the Carbon monoxide with the hemoglobin which affects the nervous system and gives a soothing signal.

Hence, the correct answer is option D.

For more information about the nicotine, refer to the link:-

brainly.com/question/787658
Answer 2
Answer: it affects the nerve signal that regilate breathing 

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Which of the following structures is most likely to be found in an autotrophic protist?

Answers

b. A chloroplast 

The options in the question contain both autotrophs and heterotrophs.
(a) A giant redwood tree = Autotroph
(b) A spider = Heterotroph
(c) A rose bush = Autotroph
(d) A mushroom = Heterotroph
(e) A blue whale = Heterotroph
Autrophs are the organisms that have the capacity to form their own food from inorganic substances like the carbon dioxide. 
Heterotrophs are the organisms that cannot produce their own food but depends on other animals or plants for their nutritional needs. 

which of the following pathogens typically causes infections on the surface of the skin and nails such as athletes foot

Answers

Athlete’s foot is a communicable disease caused by fungi. They are often caught in communal places such as swimming pools and locker rooms. These fungi are from the tine pedis which is classified into three namely the trichophyton, epidermophyton and Mircosporum. It can be also infected from animals. This fungi is called hyphae, which cannot be seen by the naked eye

1. A flexible, supporting structure found only in chordates is the A. nerve net
B. notochord
C. pharyngeal slits
D. dorsal fin.

2. Ancient chordates are thought to be most closely related to which of the following species?
A. spiders
B. earthworms
C. octopi
D. sea stars

Answers

A flexible, supporting structure found only in chordates is the notochord. The correct option among all the options that are given in the question is the second option or option "B".

Ancient chordates are thought to be most closely related to sea stars. The correct option among all the options that are given in the question is the last option or option "D".

The notochord is a flexible, supporting structure found only in chordates. Ancient chordates are most closely related to octopi.

The correct answer for the first question is B. notochord. The notochord is a flexible, supporting structure found only in chordates.

It provides support to the body and serves as a precursor to the vertebral column in vertebrates. Examples of chordates include fish, birds, and mammals.

The correct answer for the second question is C. octopi. Ancient chordates are thought to be most closely related to cephalopods like octopi.

Both groups share certain characteristics in their body structure and development.

Learn more about chordates here:

brainly.com/question/33451364

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In order to stimulate an effector in a toe, which pathway does a nerve impulse follow after it is initiated at a receptor?A. sensory neuron -> interneuron -> motor neuron
B. motor neuron -> interneuron -> sensory neuron
C. interneuron -> sensory neuron -> motor neuron
D. None of these

Answers

Answer:sensory nuerone to internuerone to motor neurones

Explanation:

The sensory nuerone usually receive inputs from the receptors cells in the skin,organs,and other parts of the body.

These receptors send signals as action potential to the spinal cord to the brain.(CNS).

Synapse take place at the synaptic junctions, in the spinal cord with the internuerone.

The latter transmit the action potential to the motor neuron which synapse with the internuerone and transmita signal to the neuromuscular junction where it synapse with the muscels at the toe.

The action potentials causes influx of calcium ions and the relase of acetylcholine neurotransmitters for action potential to reach the toe muscles (effector)for contraction

If two organisms are in the same clade, what can you predict about their relationship?They are not closely related.
They share a common ancestor.
They compete for resources.
One organism evolved into the other organism.

Answers

Answer: The correct answer is -

They share a common ancestor.

Explanation:

Evidences for the common descent of living organisms (that is whether they have evolved from the same ancestor) have been elucidated through phylogenetic tree.

A clade (also called monophyletic group) is considered as a group of individual organisms, with common ancestor and its descendants. It indicates a single "branch" on the phylogenetic tree (also known as "tree of life).

Therefore, two organisms belonging to the same clade share common ancestor.

The best answer to the stated question above is the second option.

If two organisms are in the same clade, they share a common ancestor.

What do you mean by clade?
>A clade is a group of organisms that consists of a common ancestor and all its lineal descendants, and represents a single "branch" on the "tree of life"

Which describes the mating is organisms that have different homozygous alleles for a single trait? A: monohybrid cross
b: dihybird cross
c: homozygous cross
d: heterozygous cross

Answers

The answer is A

Breeding of individuals that have genes for a single trait:
MONOHYBRID CROSS.

We call it a monodihybrid cross when we are considering a cross with only one trait or characteristic.
"mono" means one and "hybrid" means that each trait will have two different alleles (for gene A: A or a), one is dominant and the other is recessive.
A: monohybrid cross describes the mating is organisms that have different homozygous alleles for a single trait.
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According to the theory of evolution, what characteristics do all living organisms share suggesting that all life-forms on earth arose from a single ancestor?a. they share a common organic chemistry.b. they exhibit the same basic cell wall.c. they perform the same mode of reproduction.d. they have dna within their nucleus.
Saliva begins to change food starch into?