Which of these is true of meiosis? A. n--->n
B. 2n--->2n
C. n--->2n
D. 2n--->n

Answers

Answer 1

Answer: 2n --> n

You start with a cell with a diploid set of chromosomes (2n). In S phase (a part of interphase), the chromosomes are doubled (4n). After meiosis, each cell has a haploid set of chromosomes.

n-->n happens in fungi, when haploid mycelia cells replicate but stay haploid. I'm a bit rusty, though, so I'm not too sure.
n --> 2n is fertilization
2n --> 2n is mitosis, the cell replication process for somatic cells.

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How do ciliates move?a. using psuedopods
b. using flagella
c. using cilia
d. using extensions of it's body

Answers

Ciliates move (c) using cilia. It is a group of protozoans. Cilia is an organelle of ciliates. It is a hair-like organelle that helps the ciliate move. It is also used in many ways like food gathering. It could even be used to sweep down food to their central channel.

Hair would be dry and brittle without the presence of? A) sebaceous glands B) keratin C) melanin D) fat

Answers

Answer:

A) sebaceous glands

Explanation:

Sebaceous glands are responsible for producing and secreting sebum, a substance that can lubricate and waterproof the skin and hair, giving them a brighter appearance.

However, a highproduction of sebum through these glands can cause exaggerated greasiness in the hair as well as acne on the skin.

Meanwhile, low sebum production can leave the skin dull and dehydrated, causing premature aging, and leaving hair dry and brittle due to lack of lubrication.

Actually keratin is not correct

The correct answer to your question is

Sebaceous Glands.

In a active transport materials move from an area of ? Concentration and use ?

Answers

In active transport, materials move from an area of high concentration to an area of lower concentration (goes down the concentration gradient) and it requires or uses energy in the form of ATP (adenosine triphosphate)

In the mode of transport known as active transport, materials, including molecules and other substances move from an area of low concentration to an area of higher concentration, or the flow of particulates is against the concentration gradient of the cell. Due to this alternate movement of substances that is different from passive transport, energy is required for the transport of said particles. The form of energy can come from many different sources whether it be the proton motive force, and ATP. Specifically carrier proteins help assist in the movement of certain particles that cannot easily bypass the plasma membrane of a cell.

Analyze the following statements. Which of them is correct with respect to the RNA transcript formed by means of transcription?a.The RNA transcript is an exact replica of the DNA from which it is transcribed. It has the same sequence as that of its parent DNA strand.
b. The RNA transcript is complimentary to the DNA from which it is transcribed. Instead of thymine, it has uracil, which complements the adenine of DNA.
c. The RNA transcript is an exact replica of the DNA from which it is transcribed. Instead of adenine, it has uracil, which complements the thymine of DNA.

Answers

The correct answer is B. During transcritption, RNA polymerase synthesizes a complementary RNA transcript, from the DNA. RNA lacks thymine, and possess uracil instead of it. The RNA polymerase makes this antiarallel primary transcript, complementary to the DNA

Answer: The correct answer is -

b. The RNA transcript is complimentary to the DNA from which it is transcribed. Instead of thymine, it has uracil, which complements the adenine of DNA.

Explanation:

Transcription is a process of formation of mRNA (messenger RNA) from DNA. During this process, RNA polymerase enzyme uses the template DNA strand and adds the nucleotides (in mRNA in the 5' to 3' direction) complimentary to this. It adds uracil in the mRNA transcript for adenine in rhe DNA template. Similarly, for guanine in the DNA, cytosine is added.

Thus, option b) is the right answer.

Which of the following is defined as the movement of individuals to and from a population?Composition
Distribution
Dynamics
Migration

Answers

Answer:

The answer is migration

Explanation:

Migration occurs when a social group, whether human or animal, executes a transfer from its place of origin to another where it believes its quality of life will be renewed. That involves the setting of a new life, of a new, different social, political and economic environment. An example of this is the migration of people affected by the economic or political crisis, as is the case in Venezuela today.

migration is the correct answer

Imagine that you work at the medical examiner's office for a major metropolitan city. As Chief Medical officer, you investigate suspicious deaths and provide toxicology services for the county. Unfortunately, it's been a busy week. In the past five days, seven people have died, all with similar symptoms. It is your job to examine the data and determine the cause of death for these victims. The first was a 12-year-old girl. Her parents said that she was awake in the middle of the night complaining of a stuffy nose and sore throat. They gave her an extra strength Tylenol and sent her back to bed. At 7am the next morning, the parents discovered that the girl had collapsed on the bathroom floor. An ambulance rushed the girl to a nearby hospital, where she was pronounced dead. That same day, paramedics found the second victim unconscious on his kitchen floor after what they thought was an apparent heart attack. Sadly, the victim's brother and fiancée also collapsed later that night while the family gathered to morn his passing. Both had taken Tylenol to help them cope with their loss shortly before collapsing; neither survived.In the next four days, four other similar deaths were reported, all in the same neighborhood and all with similar symptoms. Are these seven deaths related? What is causing these people to die? It is your job to answer these questions before more deaths are reported.Symptoms exhibited by most patients: (i)-Dizziness
(ii)-Confusion
(iii)-Headache
(iv)-Shortness of breath/rapid breathing
(v)-Vomiting
(vi)-Most deaths were very rapid, occurring within a few hours of symptoms.
Explain whether or not you think these 7 deaths are related, and what questions you would ask the families of the victims.

Answers

Answer:

There seems to be a definite association between these seven deaths as these individuals suffered from similar symptoms like headaches, dizziness, confusion, shortness of breath, and vomiting. Also, majority of these patients took Tylenol.

The following are the questions that are needed to be asked from the victims' families or the caretakers:

1. What was the frequency of consuming Tylenol by the victims before death?

2. Whether Tylenol was consumed immediately or sometime before the death?

3. One should inquire about the victims regarding previous medical history.

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