Fast i'm in a test and i don't know sh*t

1. which two characteristics do seedless vascular plants have that nonvascular plants do not have?
a.) they have phloem and true stems.
b.) they have true roots and use spores to reproduce.
c.) they live in moist environments and have xylem.
d.) they have phloem and use spores to reproduce.

2. a group of land plants performs photosynthesis, has specialized tissues and a cuticle, but does not have seeds.
which hazard of living on land would this group of plants likely struggle with the most?

a.) water loss through leaves
b.) young plant death due to lack of water
c.) transporting water
d.) using the sun’s energy to make food

3. how is the life cycle of seedless vascular plants different from the life cycle of nonvascular plants?

a.) the adult form of each seedless vascular plant has xylem and phloem.
b.) the gametophyte stage is lacking in the life cycle of seedless vascular plants.
c.) the sperm of seedless vascular plants do not need to swim in water.
d.) the zygote of each seedless vascular plant forms before the egg is fertilized.

(1)Seedless vascular plants include ferns, whisk ferns, club mosses, and horsetails. The plants do not produce seeds so, like bryophytes, they are dispersed (spread) by windblown spores. They are vascular plants and therefore have true roots, stems, and leaves. The sperm are flagellated and require water for reproduction. So the answer is (B)

(2)Adaptations that allow seed plants to reproduce without water include flowers or cones, the transfer of sperm by pollination, and the protection of embryos in seeds. Angiosperms develop unique reproductive organs known as flowers. So #2 would be C.

(3) Life Cycle of Seedless Vascular Plants. Unlike nonvascular plants, all vascular plants—including seedless vascular plants—have a dominant sporophyte generation. Seedless vascular plants include clubmosses and ferns. ... The resulting zygote develops into an embryo that becomes a new sporophyte plant. So the answer is (C), because they blow in the wind.

1. B

2. C

3. C

ur welcome.

you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

transcription is a process in which information is rewritten. it is something our cells must do, in a more specialized and narrowly defined way. in biology, transcription is the process of copying out the dna sequence of a gene in the similar alphabet of rna. it needs to happen in the nucleus because that's where the dna is. dna is always inside the nucleus unless the cell is dividing.

transcription is the first step in gene expression, which involves copying a gene's dna sequence to make an rna molecule. transcription is performed by rna polymerases. it has three stages: initiation, elongation, and termination. rna molecules must be processed after transcription in eukaryotes.

explanation:

long version:

the protein synthesis consists two processes which are, transcription and translation. transcription takes place in the nucleus. it uses dna as a template to make an rna molecule. rna then leaves the nucleus and goes to a ribosome in the cytoplasm, where translation occurs. transcription is the first part of the central dogma of molecular biology: dna → rna. it is the transfer of genetic instructions in dna to messenger rna (mrna). during transcription, a strand of mrna is made that is complementary to a strand of dna.  

these three stages are:

  initiation: in which   is the beginning of transcription.occuring when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

    elongation: in which is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

    termination: in which is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.