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2 years ago

Caffeine is one of three naturally occurring compounds known as the ____.

Biology

1 answer:

marta [7]2 years ago

7 0

The compound is known as "<span>xanthine" and isnt only found in caffeine, it can also be found in theobromine. </span>

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Researchers have noticed that some men who were sterile because their sperm cells were unable to move also had chronic infection

zimovet [89]

Answer:

Kartegener's disorder

Explanation:

The respiratory tract has cilia which move. Sperms also have a tail that moves. They both have the same protein in their structure called microtubules. There is a disorder in which there is the absence of a part in the microtubule. Dynein arms absent in microtubules. Because the respiratory system and sperm both contain cilia that's why these two systems have a connection and not work properly.

4 0

2 years ago

_______________ is the name for the process of clearing natural vegetation and replacing it with concrete and buildings.

alexdok [17]

Answer:

Deforestation

Explanation:

^ Close enough and you have a good answer. C:

4 0

2 years ago

Read 2 more answers

Select the DATA tab. Select Pictograph and click the Tree to show the size of the tree population for the past several years.

aleksandr82 [10.1K]

Answer:

it should grow bigger over time

Explanation:

7 0

2 years ago

When a living organism dies, it stops taking in new carbon. Thus, as the radioactive carbon-14 decays, the ratio of carbon-12 to

Alexxandr [17]

Answer: The fossil is 11459 years old.

Explanation:

Half-life of carbon-14 = 5700 years

First we have to calculate the rate constant, we use the formula :

$k=\frac{0.693}{5700\text{years}}$

$k=1.21\times 10^{-4}\text{years}^{-1}$

Now we have to calculate the age of the sample:

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant = $1.21\times 10^{-4}\text{years}^{-1}
t = age of sample = ?
a = let initial amount of the reactant = 100 g
x = amount decayed = 75 g
a - x = amount left after decay process = 100 - 75 = 25 g Now put all the given values in above equation, we get
[tex]t==\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{25}$

$t=11459years$

The fossil is 11459 years old.

4 0

2 years ago

Question 3

shepuryov [24]

The statements Molecule B can be used to produce molecule A and Molecules B and C interact so that amino acids can be joined together are TRUE regarding the structures shown in the diagram (Options B and E).

<h3>What are transcription and translation?</h3>

Transcription is the process by which a DNA template (molecule B) can be used to synthesize a complementary RNA (molecule A), while translation is a process in which an sequence is used as templates to generate a protein, which requires tRNAs (molecule C) to trasnport amino acids to the ribosomes.

Therefore, with this data, we can see that DNA is molecule B used to create RNA, which is molecule A, while tRNA is represented by molecule C and it is used during translation.

Learn more about transcription and translation here:

brainly.com/question/25703686

#SPJ1

7 0

1 year ago