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4 years ago

The universe could be considered an isolated system because?

2 answers:

8 0

The answer to your question is It's a physical system that is not affected by any other system. They don't really exist, other than the universe. You might incorrectly state that an object is space is isolated from everything else, and it does seem that way. It's still affected by gravitational fields, but negligibly. However, you look at the universe which you define to be everything ever. There is nothing else that exists to interact with it, so it is an isolated system.

marin [14]4 years ago

5 0

This answer is a physical system that is not affected by any other system. You might incorrectly state that an object is space is isolated from everything else, and it does seem that way. It's still affected by gravitational fields, but negligibly. However, you look at the universe which you define to be everything ever.

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What is the function of cytosol in a cell

Sophie [7]

It is the fluid that suspends all the organells, and protects them from damage. It's also known (I think) as cytoplasm

4 0

4 years ago

Read 2 more answers

Which of the following are true about the peripheral nervous system?

attashe74 [19]

Answer:

pick one

Explanation:

big deal if you have it wrong

4 0

2 years ago

Imagine that two unlinked autosomal genes with simple dominance code in goats for size, where T is tall and t is short, and for

Fittoniya [83]

Answer:

(A) 0.0625

(B) 25%

Explanation:

Given that ;

T is tall

t is short

R is red

r is tan.

If a short, tan male goat mates with a tall, red female goat of an unknown genotype;

Let's take it one after the other;

A short tan male goat = ttrr

The female goat is an unknown genotype, we will have to determine that but we were told that it is tall and red

∴ For tall it is T and red is R;

Definitely, the female genotype should be T_ R_;

the probability genotype of the female for each allele is either:

- TT or Tt

- RR or Rr

However, from above;

the probability that the female will be Tt = $\frac{1}{2}$

the probability that the female will be Rr = $\frac{1}{2}$

the probability that the recessive allele 't' will be transferred to the offspring = $\frac{1}{2}$

the probability that the recessive allele 'r' will be transferred to the offspring = $\frac{1}{2}$

∴ the probability that they would produce short, tan offspring (ttrr) will be;

= $(\frac{1}{2})^{4}$

= $(\frac{1}{16})$

= 0.0625

(B)

One of a pea plants is homozygous recessive for both genes, resulting in the cross Yy Rr × yy rr. Calculate the percentage of green and round offspring.

For Color, Let;

Y = Yellow

y = Green

For shape, Let;

R = Round

r = wrinkled

If a cross occur between Yy Rr × yy rr. (i.e yellowround and green wrinkled)

the percentage of green and round offspring will be;

If Yy Rr self crossed; we have the following traits (YR, Yr, yR, yr)

yy rr will result to (yr, yr)

YR Yr yR yr

yr YyRr Yyrr yyRr Yyrr

Yellow Yellow Green Green

Round Wrinkled Round Wrinkled

Therefore, the percentage of Green and Round offsprings from above is:

= $\frac{2}{8}*100%$ %

= $\frac{1}{4}*100$ %

= 25%

7 0

4 years ago

Compare the bones of the upper limbs with those of lower limbs. In what ways are the shapes and arrangements of the bones simila

garik1379 [7]

Explanation:

Similarities of the shapes and arrangement of the upper limbs and the lower limbs bones:

1) The upper limbs and the lower limbs both have three segments which are upper segment, middle segment and the distal segment. In the upper limb we have the arm at the upper segment, forearm at the middle segment and the hand at the distal segment. In the lower limb we have the thigh at the upper segment, the leg at the middle segment, and the foot at the distal segment.

2) The number of bones in the arm and forearm of the upper limbs is the same as that of the thigh and leg in the lower limps. In the arm we have Single bone (i.e humerus) and in the forearm we two bones (i.e Radius and Ulna), also in the thigh we have single bone (i.e femur) and in the leg we have two bones (i.e Tibia and Fibula).

3) Both the upper and the lower limbs are fixed to the trunk by the pectoral and pelvic girdles respectively.

4) The number of compartments in the arm and forearm of the upper limbs is the same as that of the thigh and leg in the lower limps. In the arm we have two compartments and in the forearm we three compartments, also in the thigh we have two compartments and in the leg we have three compartments.

5) The number of phalanges in both the upper and lower limbs are the same (i.e five phalanges in both).

The Differences between the upper limbs and the lower limbs bones:

Upper limbs:

1. Size: The upper limb is smaller and shorter.

2. Mobility: Less firmly attached to trunk and more mobile.

3. Function: Grasping and skilled movement

4. Segment: Arm, Forearm, Hand

5. Bones: arm (humerus), forearm (Radius and Ulna) ,hand (carpals, metacarpals and phalanges ).

6. Alignment of distal parts : Aligned along the axis of the limb.

7. Position of pollex/hallux in anatomical position : Laterally placed

8. Position of flexor surface/muscle: Anteriorly/Posteriorly

9. Carrying angle: Present

Lower limbs:

1) Size: Larger and longer

2) Mobility: More firmly attached to trunk and less mobile

3) Functions: Weight bearing and locomotion

4) Segment: Thigh, Leg, Foot.

5) Bones: thigh (femur) , leg (Tibia and Fibula) , foot (Tarsals, Metatarsals and Phalanges ).

6) Alignment of the distal parts: Placed at right angle with the axis of the limb.

7) Position of pollex/hallux in anatomical position: Medially placed.

8) Position of flexor surface/muscle: Posteriorly Anteriorly .

9) Carrying angle: Absent.

Importance of the upper the limbs and the lower limbs:

The similarities and difference in the upper limbs and the lower limps are of importance so as to be able to perform their various functions effectively.

The main purpose of the upper limb is to move the hand around the body during the daily activities of humans such as grasping and skilled movement of the arm. The shoulder girdle provides a wide range of motion so that the hand can reach in all directions.

The bones of the lower limbs ( i.e thigh, leg and foot) are considerably larger and stronger than the bones of the upper limbs because the lower limbs bones support the entire weight of the body while walking, running, or jumping.

7 0

3 years ago

What are the labels of amoeba in biology

Vesnalui [34]

Explanation:

Amoeba proteus is a microscopic living organism which consists of a single cell. Like all cells, it has cytoplasm, nucleus, cell membrane and a variety of inclusions in the cytoplasm. Pseudopodia are temporary finger like projections with blunt rounded tips which are constantly being given out or withdrawn by the body.

hope it helps

3 0

3 years ago